This is a Stereo Bar with great potential and excellent build quality! I received it today and am very pleased with it.
In my opinion, there could be twice as many washers, so one could be placed underneath and one on top.
It will work well for my experiments, as it fits both a large stand and a small Manfrotto, which I plan to use for recording grasshoppers in stereo with two omni-directional microphones.
It's also great that you can attach multiple microphones if you, for example, want to compare different ones! My plan is to mount several stereo microphones to compare them with each other. A smaller (shorter) bar wouldn't fit everything as well.